purr: Install executable scripts
New formula: cattery

This package is part of the MeqTrees suite and provides a bunch of
high-level Python modules. It is quite tightly coupled to Timba aka
meqtrees but given a separate formula as it resides in a separate
part of the MeqTrees repository with its own release cycle. Since
the installation part is trivial this then becomes a dependency for
the meqtrees package.
New formula: owlcat

This package is part of the MeqTrees software suite and provides
high-level Python scripts accessed via a shell wrapper. While it
depends on the meqtrees package in reality, the dependency has been
turned around to allow meqtrees to be the single point of entry for
the suite and also to be able to use this package for testing the
whole suite. The previous release is unsupported due to the presence
of filenames that only differ in case and therefore upsets Mac OS X.
casarest: Update to HEAD and refactor

Use the latest svn repository. Refactor the formula to use HEAD instead of a bogus 1.0.0 version while obtaining the latest properly released
version 1.2.1. The clang compiler is still a problem. Add a patch to
fix missing boost_system library. Refactor install method to use the
cleaner FileUtils interface instead of system calls. Put measures_data
directory in a more standard place where casacore-data can pick it up.